Having owned both KLR650 and now DR650, I'll say the DR has much better build quality. I didn't care for the liabilities of the KLR like needing the doohickey and spring changed, needing guards to protect the radiator and water pump, needing to upgrage the rear subframe bolts, needing real footpegs, the vulnerable radaitor shrouds, and the spindly forks that need a forkbrace. The frame mountd fairing and windscreen are more about looks than function. Even with a tall windscreen, the buffeting was pretty bad on the KLR. I've monted a Parabellum on the DR and have no complaints...it is adjustable for angle,a nd this makes a huge difference. Both need a skidplate, and both suffer from poor seats. The DR is a bit more petite, and lighter. Fuel mileage and power are similar. I don't think the DR engine any smoother than my KLR. The simplicity of the DR engine is a plus IMO. Its necessary to half disassemble the KLR to adjust the valves, and you have to buy the shims ....enough said!